[1] Northwest A&F Univ, Coll Forestry, Yangling 712100, Peoples R China
[2] Chinese Acad Sci, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Peoples R China
[3] Minist Water Resources, Yangling 712100, Peoples R China
[4] Qinghai Univ, Coll Ecol & Environm Engn, Xining 810016, Peoples R China
[5] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[6] Northwest A&F Univ, Inst Soil & Water Conservat, Beijing 712100, Peoples R China